| Darby to Orangevale (California) | 2,431.15 mi (3,912.55 km) |
| Darby to Orchards (Washington) | 2,393.51 mi (3,851.98 km) |
| Darby to Orcutt (California) | 2,476.93 mi (3,986.23 km) |
| Darby to Oregon (Ohio) | 443.69 mi (714.04 km) |
| Darby to Oregon (Wisconsin) | 759.78 mi (1,222.75 km) |
| Darby to Oregon City (Oregon) | 2,399.79 mi (3,862.08 km) |
| Darby to Orem (Utah) | 1,911.94 mi (3,076.97 km) |
| Darby to Orinda (California) | 2,497.54 mi (4,019.40 km) |
| Darby to Orland Park (Illinois) | 669.00 mi (1,076.66 km) |
| Darby to Orlando (Florida) | 862.99 mi (1,388.84 km) |
| Darby to Ormond Beach (Florida) | 805.10 mi (1,295.68 km) |
| Darby to Oro Valley (Arizona) | 2,043.63 mi (3,288.91 km) |
| Darby to Oroville (California) | 2,432.91 mi (3,915.39 km) |
| Darby to Oshkosh (Wisconsin) | 738.60 mi (1,188.66 km) |
| Darby to Oskaloosa (Iowa) | 915.00 mi (1,472.56 km) |
